Scavenged M4 model glitch

I was playing Checkpoint co-op and picked up an AI's dropped M4. It had parts of another gun floating around on it which looked weird and obstructed aim. There was also a scavenged RPG in my inventory which might have something to do with it.

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i5 4690K
GTX 1060 3GB
Windows 10

This one was around in alpha. Seems to be a glitch with the grenade launcher sight. I would have thought they'd have fixed this before beta.

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